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TEAS 7 Science Digestive System Practice Exam 1 After food enters the small intestine, l...

After food enters the small intestine, lipases, proteases, and amylases are secreted into the small intestine by the

A. liver

B. gallbladder

C. salivary glands

D. pancreas

Answer Explanation:

D) pancreas

- Correct: After food enters the small intestine, lipases (for fat digestion), proteases (for protein digestion), and amylases (for carbohydrate digestion) are secreted into the small intestine by the pancreas. These digestive enzymes are produced by the pancreas and released into the duodenum, which is the first part of the small intestine. The pancreas plays a crucial role in providing these enzymes to aid in the breakdown of macronutrients (fats, proteins, and carbohydrates) into smaller molecules that can be absorbed by the intestinal lining.

A) liver

- Incorrect: The liver produces bile, which is stored in the gallbladder and released into the small intestine to aid in the emulsification of fats. While bile is important for fat digestion, it does not contain lipases, proteases, or amylases.

B) gallbladder

- Incorrect: The gallbladder stores and concentrates bile produced by the liver, but it does not secrete lipases, proteases, or amylases. Bile aids in the emulsification of fats but does not contain digestive enzymes.

C) salivary glands

- Incorrect: Salivary glands secrete saliva into the mouth, which contains amylase, an enzyme that begins the digestion of carbohydrates. However, after food enters the small intestine, digestive enzymes are primarily secreted by the pancreas, not the salivary glands.

Therefore, the Correct Answer is D.

More Questions on TEAS 7 Science

  • Q #1: In gastric bypass surgery, the stomach is reduced to hold 1 ounce of food, instead of 3 pints. This surgery would drastically impact one's

    A. excretory system

    B. digestive system

    C. circulatory system

    D. respiratory system

    Answer Explanation

    B) digestive system

    - Correct: Gastric bypass surgery involves the reduction of the stomach's size, typically to hold only about 1 ounce of food instead of its normal capacity of 3 pints or more. This surgery drastically impacts the digestive system because it alters the anatomy and physiology of the gastrointestinal tract. By reducing the stomach's size, gastric bypass surgery restricts the amount of food that can be consumed at one time, leading to reduced calorie intake and aiding in weight loss. Additionally, the rearrangement of the digestive tract may affect the absorption of nutrients, potentially leading to changes in nutrient absorption and metabolism.

    A) excretory system

    - Incorrect: While changes in diet and weight loss resulting from gastric bypass surgery may indirectly affect the excretory system, the primary impact of this surgery is on the digestive system itself, not the excretory system.

    C) circulatory system

    - Incorrect: Although obesity and associated health conditions may impact the circulatory system, such as increasing the risk of cardiovascular disease, the direct impact of gastric bypass surgery is on the digestive system, not the circulatory system.

    D) respiratory system

    - Incorrect: Gastric bypass surgery does not directly impact the respiratory system. While weight loss resulting from the surgery may improve respiratory function in individuals with obesity-related respiratory conditions such as sleep apnea, the surgery primarily affects the digestive system by altering the anatomy and function of the gastrointestinal tract.

  • Q #2: If no carbohydrate ingestion occurs in the body during a 24-hour period, liver activity provides for the body's needs by

    A. emulsification

    B. manufacturing more bile

    C. converting glycogen into glucose

    D. releasing iron

    Answer Explanation

    C) converting glycogen into glucose

    - Correct: When no carbohydrate ingestion occurs in the body during a 24-hour period, the liver can provide for the body's glucose needs by converting stored glycogen into glucose through a process known as glycogenolysis. Glycogen is a polysaccharide that serves as a storage form of glucose in the liver and muscles. When blood glucose levels decrease, such as during fasting or low carbohydrate intake, the liver breaks down glycogen into glucose molecules, which are then released into the bloodstream to maintain blood glucose levels and provide energy to cells throughout the body.

    A) emulsification

    - Incorrect: Emulsification is a process by which bile breaks down large fat globules into smaller droplets to aid in fat digestion in the small intestine. It is not related to the liver's role in glucose metabolism.

    B) manufacturing more bile

    - Incorrect: The liver produces bile continuously, regardless of carbohydrate ingestion. While the liver's production of bile is important for fat digestion and absorption, it is not directly related to glucose metabolism.

    D) releasing iron

    - Incorrect: The liver is involved in storing and regulating iron levels in the body, but releasing iron is not directly related to providing for the body's glucose needs in the absence of carbohydrate ingestion.

  • Q #3: What occurs during the digestion of proteins?

    A. Specific enzymes break down proteins into amino acids.

    B. Specific hormones break down proteins into simple sugars.

    C. Specific hormones break down proteins into complex starches.

    D. Specific enzymes break down proteins into simple sugars.

    Answer Explanation

    A) Specific enzymes break down proteins into amino acids.

    - Correct: This is the correct answer. Proteins are broken down into their constituent amino acids by specific enzymes during the process of digestion. Enzymes like pepsin in the stomach and various proteases in the small intestine facilitate this breakdown.

    B) Specific hormones break down proteins into simple sugars.

    - Incorrect: Hormones are not directly involved in breaking down proteins into simple sugars. Hormones are signaling molecules that regulate various processes in the body, including metabolism, but they don't directly participate in the breakdown of proteins into sugars.

    C) Specific hormones break down proteins into complex starches.

    - Incorrect: Hormones do not break down proteins into complex starches. Proteins are broken down into amino acids by enzymes, not hormones. Starches are complex carbohydrates and are broken down into simple sugars by enzymes like amylase, not proteins.

    D) Specific enzymes break down proteins into simple sugars.

    - Incorrect: Proteins are not broken down into simple sugars. They are broken down into amino acids by specific enzymes. Simple sugars come from the breakdown of carbohydrates, not proteins.

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